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To feed your cells requires several steps.

1. Ingestion - you must eat the food.

2. Digestion - you must break the food into smalller molecules that can be picked up by the GI cells and passed to your blood

3.Absorbtion - your GI cells must pass the broken-down food from your gut to your blood

4. If you fail to do any of these, the food will pass on through and out - excretion.

These are all pretty much one-way processes, except for ingestion.

Once you have broken food down, you can't put it back together in your gut;

Once you have passed it to the blood, you can't pass it back into the gut;

And once you have excreted it, you can't -- well, you get the idea.